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To do the division operation R1 ÷ R2, R2 should be a correct subset of R1. In the following example R1 have attributes A and B and R2 have only attribute B so R2 is a correct subse
The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
What is the archtetype/instance pattern? The archetype/instance pattern happens when one entity tracks occurrences of another entity. A common example is the relationship among
find a name whose address is erode from student table
Critically evaluate the bulleted list of information-related items in this case study. How are each contradictory to the notion of being an information-literate knowledge worker?
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
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